Feature_object

Feature objects are assigned to a segment, and a custom implementation of featureObject classes is desired. To this end, an extensible content model pattern is followed (see [B5]). This yields a basic structure for the element feature_object, defined with a parameter entities that allows extensions.

<!ENTITY % added_feature_object_classes "">

To extend the model and represent custom feature objects, the user has to create his own definition of a class and introduce the name of the new class in the parameter entity defined in the DTD.